Enter your Titre Value, Blank Titre Value, Normality of NaOH, Sample Weight, and Protein Conversion Factor into the Crude Protein Calculator to find your sample's Crude Protein Percentage, along with its Nitrogen Content and Protein Mass.
Crude Protein Percentage
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Nitrogen Content
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Protein Mass
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Crude protein is an estimate of the total protein content in a sample, calculated by measuring nitrogen content and multiplying by a conversion factor. It includes both true proteins and non-protein nitrogen compounds.
The Kjeldahl method is a standard laboratory procedure for determining nitrogen content in organic compounds. It involves digestion, distillation, and titration steps to quantify nitrogen, which is then converted to protein content.
Different food types have varying amino acid compositions and nitrogen content. Specific conversion factors (Jones' factors) provide more accurate protein estimates for different sample types like cereals, meat, or fish.
The crude protein method provides a good estimate but may overestimate true protein content since it measures all nitrogen, including non-protein nitrogen compounds. It's widely accepted for nutritional labeling and feed analysis.
The blank titre value accounts for any nitrogen contamination in reagents or equipment. Subtracting it from the sample titre value ensures accurate measurement of nitrogen from the sample only.
Normality represents the concentration of sodium hydroxide solution used in titration. It indicates the number of equivalents of NaOH per liter of solution and is crucial for accurate nitrogen quantification.